Configuration File Processing

You are given a configuration file where each line may be one of the following:

• A comment line that starts with a semicolon (;).
• A special setting line that starts with a dollar sign ($).
• A normal configuration line.

Your task is to process these lines according to the following rules:

• Ignore any line that is empty or is a comment (i.e. the first non-space character is ;).
• If a line begins with $, trim the line (remove leading and trailing whitespace) and output it as it is.
• For any other line, first trim the line and then remove all spaces. If the resulting line is not empty, output it.

The final output should be a single string with each processed line separated by a newline character (\n).

Note: If there are no lines to output, print an empty string. All formulas, if any, are represented in LaTeX format (but not needed for this problem).

inputFormat

The input consists of multiple lines representing the configuration file. Input is read from standard input (stdin) until EOF. Each line can be a comment, a special setting, or a normal configuration line.

outputFormat

Output a single string to standard output (stdout) that is the processed configuration. Each processed line must be separated by a newline character. Special lines (starting with '$') are output after trimming, while normal lines have all spaces removed. Lines that are comments or empty are ignored.## sample

; This is a sample configuration file

$SPECIAL_SETTING = ENABLED

setting1 = true
setting2  =    false   
   setting3 =   123     

; Another comment

$SPECIAL_SETTING = ENABLED
setting1=true
setting2=false
setting3=123